112 lines
6.4 KiB
HTML
112 lines
6.4 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="OVERLAY (Overlay) keyword for display files" />
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<meta name="abstract" content="Use this record-level keyword to specify that the record format that you are defining should appear on the display without the entire display being deleted first." />
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<meta name="description" content="Use this record-level keyword to specify that the record format that you are defining should appear on the display without the entire display being deleted first." />
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<meta name="DC.subject" content="OVERLAY (Overlay) keyword" />
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<meta name="keywords" content="OVERLAY (Overlay) keyword" />
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<title>OVERLAY (Overlay) keyword for display files</title>
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</head>
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<body id="rzakcmstoverla"><a name="rzakcmstoverla"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">OVERLAY (Overlay) keyword for display files</h1>
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<div><p>Use this record-level keyword to specify that the record format
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that you are defining should appear on the display without the
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entire display being deleted first.</p>
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<div class="section"><p>This keyword has no parameters.</p>
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<div class="p">Normally, the entire display
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is deleted on each output operation. All records on the display with fields
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that partially or completely overlap fields in this record are deleted before
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this record is displayed; all others remain on the display and are not changed
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in any way. A record already on the display is deleted even if fields specified
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in the record format are not selected for display. For example, assume that
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the following records are on the display: <p>REC1 (lines 1 and 2)<br />
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REC2 (lines 3 and 4)<br />
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REC3 (line 5)<br />
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REC4 (line 9)</p>
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An output of REC5 (lines 4 and 5) with OVERLAY will leave
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the display with the following records: <p>REC1 (lines 1 and 2)<br />
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REC5 (lines 4 and 5)<br />
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REC4 (line 9)</p>
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</div>
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<p>If the record with the OVERLAY keyword in effect
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is already on the display and PUTOVR, PUTRETAIN, or CLRL keyword is not specified,
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it is deleted and rewritten as a new record.</p>
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<p>When the beginning attribute
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character of a record overlaps the ending attribute character of a record
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already displayed, the attribute characters overlap each other in position
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1 of a line. (The last field of the first record displayed ends in the farthest
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right display position of the preceding line.)</p>
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<div class="p">In the above example,
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however, if the only portion of REC2 on line 4 is the ending attribute character
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of the last field of REC2 (which occurs when the last displayed character
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of the last field of REC2 is in the last position of line 3), REC2 remains
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displayed following the display of REC5 with OVERLAY. The display will have
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the following records: <p>REC1 (lines 1 and 2)<br />
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REC2 (line3)<br />
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REC5 (lines 4 and 5)<br />
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REC9 (line 9)</p>
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</div>
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<p>The display is always deleted on the first output
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operation after the file is opened, except when both ASSUME and OVERLAY are
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specified.</p>
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<p>OVERLAY is assumed by the <span class="keyword">i5/OS™</span> operating system
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for ERRMSG, ERRMSGID, PUTOVR, and CLRL functions.</p>
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<p>If OVERLAY is conditioned
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and not selected, then the ERASE, ERASEINP, MDTOFF, PROTECT, and PUTRETAIN
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keywords cannot take effect if they are selected, unless the PUTOVR keyword
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is selected. In such cases, the ERASE, ERASEINP, and MDTOFF keywords can take
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effect.</p>
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<p>If you specify OVERLAY, you should also specify the RSTDSP(*YES)
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keyword on the CRTDSPF (Create Display File) or CHGDSPF (Change Display File)
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command. Otherwise, data on the display can be lost if the file is suspended.</p>
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<p>To
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delete any of the records on the display, use the ERASE keyword to specify
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the names of the record formats to be deleted.</p>
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<p>If you also specify the
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CLRL keyword, processing proceeds according to the CLRL specification, not
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the OVERLAY specification.</p>
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<p>A warning message is sent at file creation
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time if the OVERLAY keyword is specified on a record with the DSPMOD keyword.
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At run time, the OVERLAY keyword is ignored when the display mode changes.</p>
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<p>Option
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indicators are valid for this keyword.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example</h4><p>The following example shows how to specify
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the OVERLAY keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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00021A R RECL OVERLAY
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A</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzakcmstkeyent.htm" title="You type the keyword entries that define display files in positions 45 through 80 (functions).">DDS keyword entries for display files (positions 45 through 80)</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="rzakcmstzwindow.htm" title="Use this record-level keyword to specify that the record format you are defining will be displayed using a window.">WINDOW (Window) keyword for display files</a></div>
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</div>
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</div>
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</body>
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</html>
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